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    <title>Document</title>
    <script>
        //1.表示空、否定的值都会转为false
        console.log(Boolean(''))//false
        console.log(Boolean(null))//false
        console.log(Boolean(0))//false
        console.log(Boolean(undefined))//false
        //2.其余都会转为true
        console.log(Boolean(456))//true
        console.log(Boolean('123'))//true


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